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Zurn PEX
®
Plumbing Installation Guide
ZURN PEX, INC.
HIGHWAY 11 EAST, COMMERCE, TEXAS, U.S.A. 75428 • PHONE: 855-ONE-ZURN (855-663-9876) • FAX: 903-886-2583 • www.zurn.com
Important:
When running Zurn PEX tubing, be sure to keep it away
from potential sources of heat. Maintain a minimum of 12 inches
between Zurn PEX and any recessed light fixture and a minimum
of 6 inches between Zurn PEX and any gas appliance vent.
The use of zip ties to attach Zurn PEX to DWV piping is acceptable
so long as the ties leave enough room for free movement of the
tubing.
Note:
When installing runs of Zurn PEX, it is sometimes necessary
to pull one tube past another. Care should be taken to make sure
that the friction of the moving tube does not burn or wear a notch
in the stationary tube. If this occurs, the notched section of the
tube must be cut out and replaced.
Tubing Expansion
Zurn PEX tubing should not be pulled tight during installation.
Adequate slack should be determined in order to prevent the tubing
from exerting tensile loads on the connections to the fittings.
Allow 1/8” per foot of tube length as slack. This should cover
installations from 35°F - 160°F.
Bending Zurn PEX Tubing
The minimum bend radius for Zurn PEX is 6 times the outside
diameter of the tubing, when bending it with the natural curvature
of the coil.
Top Out Installation
, continued
Outer
Minimum
Tubing Size
Diameter
Bend Radius
3/8"
.500"
3.00"
1/2"
.625"
3.75"
3/4"
.875"
5.25"
1" 1.125"
6.75"
1-1/4" 1.375"
8.25"
1-1/2" 1.625"
9.75"
2" 2.125" 12.75"
Metal Studs
Protective sleeves or bushings should be used on Zurn PEX tubing
when penetrating metal studs. Sleeves and bushings are not
required when penetrating ordinary wood or particle board if the
holes are at least 1/8” larger than the tube size and tube move ment
is not restricted.
Insulating Tubing
Zurn PEX is resistant to freeze damage; however, installation specific
variables can affect the performance of the system if it is allowed
to freeze up. In general, plumbing codes specify that tubing run
through attics and exterior walls should be insulated. As such,
Zurn PEX tubing should be insulated according to code require ments.
Insulation that is typically used in copper and CPVC installations
would provide equivalent protection for Zurn PEX tubing.
Note:
When using expanding foam to insulate tubing, please contact
Zurn for recommendations. While many expanding foams have been
tested and have shown no adverse effects to PEX tubing, we cannot
guarantee all foams are the same.
Condensation
Zurn PEX tube transfers heat at a much slower rate than copper
tube. This means that it is much less likely for condensation
to form on the Zurn PEX tube than it is for copper in the same
conditions. This does not mean that condensation cannot form
under certain conditions. The site variables of relative humidity,
ambient temperature and water temperature are all factors in the
formation of condensation on any piping.
Nailing Plates
Nailing plates should be used when Zurn PEX tubing is passing
through a stud within 2" of a nailing surface. Using a nailing plate
minimizes the possibility of damage to the tube from nails or
drywall screws.
Note:
Best results are achieved by using clamps, pipe insulators,
and strapping designed for plastic plumbing systems.
Wall
Stud
Wall
Stud
Note:
If you must bend against the natural curvature of the coil,
these minimums must be multiplied by 3.
